target/mips: Use decode_ase_msa() generated from decodetree

Now that we can decode the MSA ASE with decode_ase_msa(),
use it and remove the previous code, now unreachable.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201215225757.764263-21-f4bug@amsat.org>
Tested-by: Jiaxun Yang <jiaxun.yang@flygoat.com>

target/mips/msa_translate.c

@@ -412,33 +412,6 @@ static bool trans_BNZ_x(DisasContext *ctx, arg_msa_bz *a)
     return gen_msa_BxZ(ctx, a->df, a->wt, a->s16, true);
 }
 
-void gen_msa_branch(DisasContext *ctx, uint32_t op1)
-{
-    uint8_t df = (ctx->opcode >> 21) & 0x3;
-    uint8_t wt = (ctx->opcode >> 16) & 0x1f;
-    int64_t s16 = (int16_t)ctx->opcode;
-
-    switch (op1) {
-    case OPC_BZ_V:
-    case OPC_BNZ_V:
-        gen_msa_BxZ_V(ctx, wt, s16, (op1 == OPC_BZ_V) ?
-                                    TCG_COND_EQ : TCG_COND_NE);
-        break;
-    case OPC_BZ_B:
-    case OPC_BZ_H:
-    case OPC_BZ_W:
-    case OPC_BZ_D:
-        gen_msa_BxZ(ctx, df, wt, s16, false);
-        break;
-    case OPC_BNZ_B:
-    case OPC_BNZ_H:
-    case OPC_BNZ_W:
-    case OPC_BNZ_D:
-        gen_msa_BxZ(ctx, df, wt, s16, true);
-        break;
-    }
-}
-
 static void gen_msa_i8(DisasContext *ctx)
 {
 #define MASK_MSA_I8(op)    (MASK_MSA_MINOR(op) | (op & (0x03 << 24)))
@@ -2188,7 +2161,7 @@ static void gen_msa_vec(DisasContext *ctx)
     }
 }
 
-void gen_msa(DisasContext *ctx)
+static void gen_msa(DisasContext *ctx)
 {
     uint32_t opcode = ctx->opcode;
 

target/mips/translate.c

@@ -6,6 +6,7 @@
  *  Copyright (c) 2006 Thiemo Seufer (MIPS32R2 support)
  *  Copyright (c) 2009 CodeSourcery (MIPS16 and microMIPS support)
  *  Copyright (c) 2012 Jia Liu & Dongxue Zhang (MIPS ASE DSP support)
+ *  Copyright (c) 2020 Philippe Mathieu-Daudé
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -135,8 +136,6 @@ enum {
     OPC_JIALC    = (0x3E << 26),
     /* MDMX ASE specific */
     OPC_MDMX     = (0x1E << 26),
-    /* MSA ASE, same as MDMX */
-    OPC_MSA      = OPC_MDMX,
     /* Cache and prefetch */
     OPC_CACHE    = (0x2F << 26),
     OPC_PREF     = (0x33 << 26),
@@ -28827,21 +28826,6 @@ static bool decode_opc_legacy(CPUMIPSState *env, DisasContext *ctx)
             }
             break;
         }
-        case OPC_BZ_V:
-        case OPC_BNZ_V:
-        case OPC_BZ_B:
-        case OPC_BZ_H:
-        case OPC_BZ_W:
-        case OPC_BZ_D:
-        case OPC_BNZ_B:
-        case OPC_BNZ_H:
-        case OPC_BNZ_W:
-        case OPC_BNZ_D:
-            if (ase_msa_available(env)) {
-                gen_msa_branch(ctx, op1);
-                break;
-            }
-            /* fall through */
         default:
             MIPS_INVAL("cp1");
             gen_reserved_instruction(ctx);
@@ -29023,16 +29007,13 @@ static bool decode_opc_legacy(CPUMIPSState *env, DisasContext *ctx)
             gen_compute_branch(ctx, op, 4, rs, rt, offset, 4);
         }
         break;
-    case OPC_MSA: /* OPC_MDMX */
+    case OPC_MDMX: /* MMI_OPC_LQ */
         if (ctx->insn_flags & INSN_R5900) {
 #if defined(TARGET_MIPS64)
-            gen_mmi_lq(env, ctx);    /* MMI_OPC_LQ */
+            gen_mmi_lq(env, ctx);
 #endif
         } else {
             /* MDMX: Not implemented. */
-            if (ase_msa_available(env)) {
-                gen_msa(ctx);
-            }
         }
         break;
     case OPC_PCREL:
@@ -29065,6 +29046,13 @@ static void decode_opc(CPUMIPSState *env, DisasContext *ctx)
         gen_set_label(l1);
     }
 
+    /* Transition to the auto-generated decoder.  */
+
+    /* ISA extensions */
+    if (ase_msa_available(env) && decode_ase_msa(ctx, ctx->opcode)) {
+        return;
+    }
+
     if (decode_opc_legacy(env, ctx)) {
         return;
     }

target/mips/translate.h

@@ -82,8 +82,6 @@ enum {
     OPC_BC1      = (0x08 << 21) | OPC_CP1, /* bc */
     OPC_BC1ANY2  = (0x09 << 21) | OPC_CP1,
     OPC_BC1ANY4  = (0x0A << 21) | OPC_CP1,
-    OPC_BZ_V     = (0x0B << 21) | OPC_CP1,
-    OPC_BNZ_V    = (0x0F << 21) | OPC_CP1,
     OPC_S_FMT    = (FMT_S << 21) | OPC_CP1,
     OPC_D_FMT    = (FMT_D << 21) | OPC_CP1,
     OPC_E_FMT    = (FMT_E << 21) | OPC_CP1,
@@ -93,14 +91,6 @@ enum {
     OPC_PS_FMT   = (FMT_PS << 21) | OPC_CP1,
     OPC_BC1EQZ   = (0x09 << 21) | OPC_CP1,
     OPC_BC1NEZ   = (0x0D << 21) | OPC_CP1,
-    OPC_BZ_B     = (0x18 << 21) | OPC_CP1,
-    OPC_BZ_H     = (0x19 << 21) | OPC_CP1,
-    OPC_BZ_W     = (0x1A << 21) | OPC_CP1,
-    OPC_BZ_D     = (0x1B << 21) | OPC_CP1,
-    OPC_BNZ_B    = (0x1C << 21) | OPC_CP1,
-    OPC_BNZ_H    = (0x1D << 21) | OPC_CP1,
-    OPC_BNZ_W    = (0x1E << 21) | OPC_CP1,
-    OPC_BNZ_D    = (0x1F << 21) | OPC_CP1,
 };
 
 #define MASK_CP1_FUNC(op)           (MASK_CP1(op) | (op & 0x3F))
@@ -174,8 +164,6 @@ extern TCGv bcond;
 
 /* MSA */
 void msa_translate_init(void);
-void gen_msa(DisasContext *ctx);
-void gen_msa_branch(DisasContext *ctx, uint32_t op1);
 
 /* decodetree generated */
 bool decode_ase_msa(DisasContext *ctx, uint32_t insn);